dovecot - Apr 2012 - Configuration advices for a 50000 mailboxes server(s)

Hello

I need some feedbacks advices of experienced admins
I will have to setup in few monthes an email system
for approx 50K "intensives" users.

The only mandatory thing will be I must use HP proliant servers

The operating system will be FreeBSD or Linux

Thank you for any advices

Frank,

     Here we have approx. 200K users with 4000 concurrent connections 
(90% POP3 users)  All servers in virtual environment Vmware, supermicro 
servers and Netapp Metrocluster storage solutions (nfs storage with 10G 
ethernet network)  POP3 sessions take betwen 40 and 300 milisecons at 
connect, auth and list.  All accounts lives in LDAP, CentOS 5 and exim 
like a mta relay.

Regards



El 17-04-2012 4:54, Frank Bonnet escribi?:
> Hello
>
> I need some feedbacks advices of experienced admins
> I will have to setup in few monthes an email system
> for approx 50K "intensives" users.
>
> The only mandatory thing will be I must use HP proliant servers
>
> The operating system will be FreeBSD or Linux
>
> Thank you for any advices
>
>
-- 
Mauricio L?pez Riffo
Red Hat Certified Engineer
804006455319519
Administrador de Servicios Internet
?rea Ingenier?a
Gtd Internet S.A.
http://www.grupogtd.com/
Moneda 920, Oficina 602 - Fono : +562 4139742

>     Here we have approx. 200K users with 4000 concurrent connections  
> (90% POP3 users)  All servers in virtual environment Vmware, supermicro  
> servers and Netapp Metrocluster storage solutions (nfs storage with 10G  
> ethernet network)  POP3 sessions take betwen 40 and 300 milisecons at  
> connect, auth and list.  All accounts lives in LDAP, CentOS 5 and exim  
> like a mta relay.
Similar setup here. Maybe 15-20K concurrent connections, imap only
(pop is not handled by dovecot yet)  about 800K mailboxes. We have all
bare metal servers, linux. Currently 35 servers handling the load
easily. We could run on 1/3rd of the load probably.

In front of the 35 servers are 3 directors, handling imap only, although
im in the process of adding LMTP/sieve to the mix. 

Backend storage is NetApp Metrocluster over 2 datacenters. 

Cor